aftermarket, unless you can find some info on it as a GM accessory - that sort of thing was relatively common on pre-war cars and trucks, and carried gas/oil/water - like these

Bill

Last edited by red58; 10/03/2013 5:24 PM.

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics